Option Explicit

 Private Const UnitPixel                  As Long =

 Private Const EncoderQuality             As String = "{1D5BE4B5-FA4A-452D-9CDD-5DB35105E7EB}"

 Private Type GdiplusStartupInput

     GdiplusVersion           As Long

     DebugEventCallback       As Long

     SuppressBackgroundThread As Long

     SuppressExternalCodecs   As Long

 End Type

 Private Enum EncoderParameterValueType

     EncoderParameterValueTypeByte =

     EncoderParameterValueTypeASCII =

     EncoderParameterValueTypeShort =

     EncoderParameterValueTypeLong =

     EncoderParameterValueTypeRational =

     EncoderParameterValueTypeLongRange =

     EncoderParameterValueTypeUndefined =

     EncoderParameterValueTypeRationalRange =

 End Enum

 Private Type EncoderParameter

     GUID( To )        As Long

     NumberOfValues      As Long

     Type                As EncoderParameterValueType

     Value               As Long

 End Type

 Private Type EncoderParameters

     Count               As Long

     Parameter           As EncoderParameter

 End Type

 Private Type ImageCodecInfo

     ClassID( To )     As Long

     FormatID( To )    As Long

     CodecName           As Long

     DllName             As Long

     FormatDescription   As Long

     FilenameExtension   As Long

     MimeType            As Long

     Flags               As Long

     Version             As Long

     SigCount            As Long

     SigSize             As Long

     SigPattern          As Long

     SigMask             As Long

 End Type

 Private Declare Function GdiplusStartup Lib "gdiplus" (Token As Long, inputbuf As GdiplusStartupInput, Optional ByVal outputbuf As Long = ) As Long

 Private Declare Sub GdiplusShutdown Lib "gdiplus" (ByVal Token As Long)

 Private Declare Function GdipSaveImageToFile Lib "gdiplus" (ByVal hImage As Long, ByVal sFilename As Long, clsidEncoder As Any, encoderParams As Any) As Long

 Private Declare Function GdipDisposeImage Lib "gdiplus" (ByVal Image As Long) As Long

 Private Declare Function GdipCreateBitmapFromHBITMAP Lib "gdiplus" (ByVal hbm As Long, ByVal hPal As Long, Bitmap As Long) As Long

 Private Declare Function GdipGetImageEncodersSize Lib "gdiplus" (numEncoders As Long, Size As Long) As Long

 Private Declare Function GdipGetImageEncoders Lib "gdiplus" (ByVal numEncoders As Long, ByVal Size As Long, Encoders As Any) As Long

 Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)

 Private Declare Function lstrlenW Lib "kernel32" (ByVal psString As Any) As Long

 Private Declare Function CLSIDFromString Lib "ole32" (ByVal lpszProgID As Long, pCLSID As Any) As Long

 Private Declare Function GdipBitmapSetResolution Lib "gdiplus" (ByVal Bitmap As Long, ByVal xdpi As Single, ByVal ydpi As Single) As Long

 Public Enum ImageFileFormat

     Bmp =

     Jpg =

     Png =

     Gif =

 End Enum

 Public Function SaveStdPicToFile(Stdpic As StdPicture, ByVal FileName As String, _

                               Optional ByVal FileFormat As ImageFileFormat = Jpg, _

                               Optional ByVal JpgQuality As Long = , _

                               Optional Resolution As Single) As Boolean

     Dim CLSID()        As Long

     Dim Bitmap          As Long

     Dim Token           As Long

     Dim Gsp             As GdiplusStartupInput

     Gsp.GdiplusVersion =                       'GDI+ 1.0版本

     GdiplusStartup Token, Gsp                   '初始化GDI+

     GdipCreateBitmapFromHBITMAP Stdpic.Handle, Stdpic.hPal, Bitmap

     If Bitmap <>  Then                          '说明我们成功的将StdPic对象转换为GDI+的Bitmap对象了

         GdipBitmapSetResolution Bitmap, Resolution, Resolution

         Select Case FileFormat

         Case ImageFileFormat.Bmp

             If Not GetEncoderClsID("Image/bmp", CLSID) = - Then

                 SaveStdPicToFile = (GdipSaveImageToFile(Bitmap, StrPtr(FileName), CLSID(), ByVal ) = )

             End If

         Case ImageFileFormat.Jpg                    'JPG格式可以设置保存的质量

             Dim aEncParams()        As Byte

             Dim uEncParams          As EncoderParameters

             If GetEncoderClsID("Image/jpeg", CLSID) <> - Then

                 uEncParams.Count =                                         ' 设置自定义的编码参数，这里为1个参数

                 If JpgQuality <  Then

                     JpgQuality =

                 ElseIf JpgQuality >  Then

                     JpgQuality =

                 End If

                 ReDim aEncParams( To Len(uEncParams))

                 With uEncParams.Parameter

                     .NumberOfValues =

                     .Type = EncoderParameterValueTypeLong                   ' 设置参数值的数据类型为长整型

                     Call CLSIDFromString(StrPtr(EncoderQuality), .GUID())  ' 设置参数唯一标志的GUID，这里为编码品质

                     .Value = VarPtr(JpgQuality)                                ' 设置参数的值：品质等级，最高为100，图像文件大小与品质成正比

                 End With

                 CopyMemory aEncParams(), uEncParams, Len(uEncParams)

                 SaveStdPicToFile = (GdipSaveImageToFile(Bitmap, StrPtr(FileName), CLSID(), aEncParams()) = )

             End If

         Case ImageFileFormat.Png

             If Not GetEncoderClsID("Image/png", CLSID) = - Then

                 SaveStdPicToFile = (GdipSaveImageToFile(Bitmap, StrPtr(FileName), CLSID(), ByVal ) = )

             End If

         Case ImageFileFormat.Gif

             If Not GetEncoderClsID("Image/gif", CLSID) = - Then                '如果原始的图像是24位，则这个函数会调用系统的调色板来将图像转换为8位，转换的效果会不尽人意,但也有可能系统不自动转换，保存失败

                 SaveStdPicToFile = (GdipSaveImageToFile(Bitmap, StrPtr(FileName), CLSID(), ByVal ) = )

             End If

         End Select

     End If

     GdipDisposeImage Bitmap      '注意释放资源

     GdiplusShutdown Token       '关闭GDI+。

 End Function

 Private Function GetEncoderClsID(strMimeType As String, ClassID() As Long) As Long

     Dim Num         As Long

     Dim Size        As Long

     Dim I           As Long

     Dim Info()      As ImageCodecInfo

     Dim Buffer()    As Byte

     GetEncoderClsID = -

     GdipGetImageEncodersSize Num, Size               '得到解码器数组的大小

     If Size <>  Then

        ReDim Info( To Num) As ImageCodecInfo       '给数组动态分配内存

        ReDim Buffer( To Size) As Byte

        GdipGetImageEncoders Num, Size, Buffer()            '得到数组和字符数据

        CopyMemory Info(), Buffer(), (Len(Info()) * Num)     '复制类头

        For I =  To Num             '循环检测所有解码

            If (StrComp(PtrToStrW(Info(I).MimeType), strMimeType, vbTextCompare) = ) Then         '必须把指针转换成可用的字符

                CopyMemory ClassID(), Info(I).ClassID(),   '保存类的ID

                GetEncoderClsID = I      '返回成功的索引值

                Exit For

            End If

        Next

     End If

 End Function

 Private Function PtrToStrW(ByVal lpsz As Long) As String

     Dim Out         As String

     Dim Length      As Long

     Length = lstrlenW(lpsz)

     If Length >  Then

         Out = StrConv(String$(Length, vbNullChar), vbUnicode)

         CopyMemory ByVal Out, ByVal lpsz, Length *

         PtrToStrW = StrConv(Out, vbFromUnicode)

     End If

 End Function